Electrical coil



S. R. WRIGHT.

ELECTRICAL COIL.

Jan; 2, 1923.

FILED AUG. 22,1921.-

Patented Jan. 2,1923.

UNITED STATES PATENT OFFICE.

- STANLEY WEIGHT, OF RAXVDON, NEAR LEEDS, ENGLAND, ASSIGNOB TO IGEANIC ELECTRIC COIl TPANY LIMITED, OF LONDON ENGLAND, A CORPORA- TION OF GREAT BRITAIN.

ELECTRICAL COIL.

Application filed August 22, 1921.

To all 710m 27' may concern:

ll tha l i (c of the to Us or la; one 1 and in par. 7 Volt wound lie 1,

r obtains in the secondary jii i tension transformers. -7 oi? the present is to in which the Value .5 the ins as the initial surge potenper layer of the winding increases.

in electrh c coil according to this l]11611 l in ct 5 t tr layers of wire varies t the thickness of the coil whilst t s or layers of" insulation are of constant width.

yiug the. invention to t lar liltllfllOift, cl the coils constitu i of hi h tension transfornh core of "3 tie sub- 111 111 width 'wh are gradually in used in the tull or minimum w cl)- utthe centre of the thickwinding when tl wi windings c1- J dually dia minimum is again obtained mm -1.] i 7 is app lei. he Xers or insulating material cons ,7

in order bnderstood by aid of the which 2 F l is longitudinal section through a coil wound in accordance with this invention.

Fig. 2 is an end View of the completed coil. In the drawings or represents the conductor windings and b the insulation of a coil constituting the secondary windings of a high a: the invention be clearly same will non e described accompanying drawings 111 Serial No 494,411.

tension transformer. This coil is built up in the usual manner upon a core. the first few layers consisting of insulation. \Vhen a sutficient thickne s of insulation is wound upon the core a, foreshortened layer oi? wire is applied and then a layer or layers of insulation. ach succeeding layer of wire increases in th until a point 0 approximating to the centre of the winding is reached, when the succeeding layers 'adually diminish in width until the fin l layer is applied. The layers of insulation are of app oximately const t width tln'ougliout the coil with the result that the greatest value or insulation obtains at the initial and final layers of the coil where exists in practice the greatest initial surge potential difilerence.

Such windings as above described may be obtained with any winding machine in which provision is made for gradually varying the length of the wire traverse.

What I claim and desire to secure by Letters Patent is:

1. An electrical wound coil comprising windings of wire and insulating material in which the windings or layers of wire are of variable width and the windings or layers of insulation of constant width.

2. An electrical wound coil comprising windings of wire and insulating material in which the first winding or layer of wire nearest to the core of the coil is of minimum width whilst the subsequent windings or layers of wire are gradually increased in width until the full width is obtained at or about the centre of the coil winding when the width of the windings or layers of wire gradually 'nish until a minimum is again obtained 1th the last winding or layer of wire applied. the width of each layer of insulation remaining constant throughout the coil for purposes specified.

An electrical wound coil according to claim 1 in which the windings or layers of insulat material alternate with the windings or layers of wire and in which the width of each winding or layer of wire varies throughout the coil whilst the windings or layers of insulating material remain constant width throughout for the purposes specified.

In witness whereof I aflix my signature.

STANLEY ROBERT WRIGHT. 

